Phase vocoder
From The Art and Popular Culture Encyclopedia
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| - | '''Auto-Tune''' is a [[proprietary software|proprietary]] [[audio processor]] created by Antares Audio Technologies. Auto-Tune uses a [[phase vocoder]] to correct pitch in vocal and instrumental performances. It is used to disguise off-key inaccuracies and mistakes, and has allowed singers to perform perfectly tuned vocal tracks without the need of singing in tune. While its main purpose is to slightly bend sung pitches to the nearest true [[semitone]] (to the exact pitch of the nearest tone in traditional [[equal temperament]]), Auto-Tune can be used as an effect to distort the human voice when pitch is raised or lowered significantly. | + | A '''phase vocoder''' is a type of [[vocoder]] which can [[Scaling (geometry)|scale]] both the [[frequency]] and [[time domain]]s of audio signals by using [[Phase (waves)|phase]] information. The computer [[algorithm]] allows [[frequency-domain]] modifications to a digital sound file (typically [[Audio timescale-pitch modification|time expansion/compression and pitch shifting]]). |
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| + | At the heart of the phase vocoder is the [[short-time Fourier transform]] (STFT), typically coded using [[fast Fourier transform]]s. The STFT converts a [[time domain]] representation of sound into a [[time-frequency representation]] (the "analysis" phase), allowing modifications to the amplitudes or phases of specific frequency components of the sound, before resynthesis of the [[frequency domain]] representation into the time domain by the inverse STFT. The time evolution of the resynthesized sound can be changed by means of modifying the time position of the STFT frames prior to the resynthesis operation | ||
| + | allowing for time-scale modification of the original sound file. | ||
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| + | == See also == | ||
| + | * [[Auto tune]] | ||
| + | * [[Audio timescale/pitch modification]] | ||
| + | * [[Vocoder]] | ||
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A phase vocoder is a type of vocoder which can scale both the frequency and time domains of audio signals by using phase information. The computer algorithm allows frequency-domain modifications to a digital sound file (typically time expansion/compression and pitch shifting).
At the heart of the phase vocoder is the short-time Fourier transform (STFT), typically coded using fast Fourier transforms. The STFT converts a time domain representation of sound into a time-frequency representation (the "analysis" phase), allowing modifications to the amplitudes or phases of specific frequency components of the sound, before resynthesis of the frequency domain representation into the time domain by the inverse STFT. The time evolution of the resynthesized sound can be changed by means of modifying the time position of the STFT frames prior to the resynthesis operation allowing for time-scale modification of the original sound file.
See also
